cookson



(No Model.) 3 Sheets-Sheet l,

1". N. COOKSON. Y PBEDING MEGHANISM POR SEWING MACHINES. No. 411,491. Patented Sept. 24, 18819.

3 Sheets-Sheet 2.

(No Model.)

P. N. GOOKSON. PBBDING MEGHANISM FOR. SEWING MACHINES.

No. 411,491. Patented Sept. 24, 1889.

. U. Www/vk.

N. FEERS. FhefrLihographa't. Washingmn. D. C.

(No Model.) 3 Sheets-Sheet 3.

P. N. GOOKSON. YPBEDINeM1:GHANISM POR SEWING MACHINES. 110.411.491. Patented Sept. 24, 1889.

mM/MVM. PMWM Azomgy N. PETERS, PhoIo-Lllhngmpher. Washington D. C.

UNITED STATES PATENT OEEICE.

FREDERICK NESFIELD COOKSON, OF VVOLVERHAMPTON, ENGLAND.

FEEDING MECHANISIVI FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent N o. 411,491, dated September 24, 1889. Application filed October l1, 1886. Serial No. 215,855. l (No model.) Patented in England August ll, 1886, No. 10,297.

T0 ali whom it may concern.-

Be it known that I, FREDERICK NEsFIELD COOKSON, manufacturer, a subject of the Queen of `Great Britain and Ireland, residing at Wolverhampton, England, have invented a new and useful Improved Sewing-Machine, (for Which I have obtained Letters Patent in Great Britain, No. 10,297, dated August l1, 1886,) of which the following is a specification.

My invention relates to improvements in lock-stitch sewing-machines, and is more particularly applicable to small and portable hand-machines, although I wish it. to be distinctly understood that my invention is not conned to the latter class of sewing-machines.

The said invention relates more particularly to improved mechanism for actuating the clotlrfeeding presser-foot.

I attain the objects of my said invention by means of the mechanism illustrated in the following igures, in which like parts are marked throughout the iigures with the same reterenceletter.

Figure l is a side elevation showing the needle as on the point of piercing the cloth. Fig. 2 is a rear elevation corresponding with Fig. l, but without the cramping device. Fig. 3 is an enlarged sectional elevation of the shuttle, shuttle-case, shuttle-sprin g, and bell-lever. Fig. 4 is a rear elevation. Fig. 5 is a plan, partly in section, taken on the line Y Z of Fig. 4. Fig. 6 is a rear elevation-the horizontal traversing plate having been removed-showing the position of the parts when the shuttle is on the point of making its return-stroke preparatory to making a stitch. Figs. 7 and 8 are respectively side and rear elevations of my improved sewing-machine fitted with an alternative-traversing gear, the crank being a little in advance of the position illustrated in Figs. l and 2.

I Wish to point out that the igures illustrate my invention as applied to a small hand-ma chine, and'that although this is the type of sewingonachine to which the invention is more particularly applicable with the greatest advantage my invention is not con lined to the type of machine illustrated, inasmuch as the novelties of construction constituting' my invention may be advantageously applied t-o lock-stitch sewing-machines of any size and kind.

A is the standard of the machine.. Two lateral extensions a a project from' the lower part of the rear edge of the standard and constitute, with the thumb-screw a2, a convenient means by which the machine can be cramped to a table. This method of fixing the machine may be replaced by a base of any convenient kind; but it is one that is peculiarly suitable as a means of holding the machine made as illustrated in a working position.

B is the clot-heplate; (La plate in a parallel plane therewith and conveniently strengthened by two brackets c c. The adjacent 'faces of these two plates B and C are grooved 1o receive a slide D, which forms one side of the shuttle-race and in the inner face of which the needle-groove d is formed.

E is a bracket from which the spool-peg e projects. 1

F is the first-motion wheel, capable of rotation upon an axis f, projecting from the standard, and of gearing with its pinion G, the shaft g of which works in a journal c formed for that purpose on the top of the standard.

II is a halfcrank fast on the opposite end of the pinion-shaft, making junction by means of the connecting-rod 7L with a cross-head I, which receives therefrom a reciprocating linear stroke in the vertical guide-slot t' in the standard A.

J is the needle carried by the cross-head I7 which is thus made to do duty as a needlebar, and to which the thread e is led from the top spool through any con venient. or suitable tension device.

K is the cloth-feeding presser-t`oot, carried by the lower extremity of the stein lo. The presser is raised by a stud z" on the crosshead engaging with a corresponding projection lo from the upper extremity ot the stem la and returned by a spiral spring 7a2. Two guides los 7c"L are provided to serve as guides for the stem.

L is a link fixed to the crosshead I by a set-screw, and having a vertical slot Zformed in its lower halt', which slot receives a stud m, projecting from the upper part of the face of a second link Il, which works in a groove-m',

IOC

cut in the back face of the standard A. The accuracy of the travel of the second link M is guaranteed by the rectilinear groove in which it works, and the stud m and slot Z act as a guide for the link L. The length of the slotZ is about three-quarters of the length of the stroke of the needle.

N is a bell-crank having its axis upon a stud n, projecting from the front face of the standard. The shorter arm n of the bellcrank is connected to the lower extremity of the second link M by a pin n2. A quadrantal slot n3 is cut in the standard and a horizontal one m2 in the link M to allow of the throw of this pin.

O is the shuttle-case, fixed upon the extremity of the longer arm of the bell-leverN; o, the shuttle, and 0 the spring to press the shuttle up to the inner face of the slide I).

P is a bent link having its axis upon p', a stud projecting from the top of the link M. A screw-pin p', passing through a curved slot p2 into the standard A, prevents the link P being moved otherwise than by the link L. Upon the side of the link L, I form a projection Z, the lower edge Z2 of which can engage with the nose p3 of the link P as the link L descends, thereby compelling it to enter the notch in the edge of the link L, from which it is expelled by the bottom edge Z:z of said notch as the said link L ascends. During this ascent or upstroke the straight edge p of the link L is in close contact for thewhole of its length with the edge p4 of the link.

Q is a plate receiving a reciprocating horizontal movement from the stud Z4, which projects from the link L into a twice-bent-or serpentine slot q, formed in said plate, and which bears against the opposite faces of said slot alternately as the link'L makes its up and down strokes, respectively. I provide two studs q q', passing through two guideslots q2 q2, for the purpose of keepiiv g the motion ot' the plate truly horizontal.

R is a lever having its fulcrum in the bracket 7a4 or in a stud depending therefrom. One end of it is connected to the plate Q by means of a knuckle-joint r, or its equivalent,

while the other end is forked and embraces the stem Zt' of the cloth-feeding presser-foot.

S is a spring-detent always bearing against a projection h5 on the stem of the cloth-feeding presser-foot. A small notch k6 is cut in the edge of this projection7 into which the detent engages when the cloth-feeding presser-foot is raised to the top of its stroke for the purpose of detaining it there for a moment. The projection 705 is released from the hold of the detent S by the lever R as the latter is moved by the downstroke of the stud Z4.

In Figs. 7 and 8 I illustrate anY alternative device for raising the cloth-feeding presserfoot, which may replacethe two projections t" Zr on the cross-head and stem Z1: of the clothfeeding presser-foot, respectively illustrated in Fig. l and described in reference thereto.

I use a cranked lever having its fulcrum in the standard A at t. One arm T of the lever lies upon the top of thev guide 7c3. Its extremity t', bent at a right angle, is immediately under an enlargement k7 upon the end of the stem Zt of the cloth-feeding presserfoot. The other arm t2 is bent forward, so that a pin g2, projecting from the pinion, can engage with it as the pinion revolves. As the pinion revolves, the pin g2 therefore bears against the arm t? atthe moment when the presser-foot is required to begin to rise and pushes the arm t2 before it. The extremity t of the arm T moves through a corresponding arc, and consequently raises the stein Zt by lifting the enlargement k7. As soon as the cloth-feeding presser-foot has been raised as high as required the pin g2 releases the arm lf2, and the lever and cloth-feeding presserfoot are returned by the spiral spring k2.

A lock-stitch sewing-machine constructed according to my invention operates as follows: As the needle descends, and when it has made about iive-eighths of it-s downstroke, the projection Z on the link L bears upon the nose p3 of the bent link P, causing the latter to turn uponits axis p and to drive the link M downward. As soon as the link M is set in motion the shuttle is thrown to the front of the shuttle-race by means of the pin 'n2 and the bell-crank lever N. This throw is accomplished by the time the needle has reached the end of its stroke. The needle at once commences its upstroke, looping the top thread in the shuttle-race in the well-known way, the shuttle remaining the while in its last-mentioned position until the lower edge Z3 of the notch in the link L bears against the straight edge p4 of the nose p3, when the shuttlc-case is thrown forward,thereby taking the IOO shuttle through the increasing loop in the top l thread. The stitch is locked by the completion of the upstroke of the needle. When, however, the crank is about fifty degrees from the vertical, the stud Zl bears against the upper edge of tlie serpentine part of the slot Aq in the plate Q, causing it to move on the studs q toward the front ofl the machine. This motion is communicated to the cloth-feeding presser-foot K through the lever R, and the cloth is moved over the cloth-plate B the distance of one stitch. After the completion-of the cloth-feedin g presser-foot the stud t" on the cross-head I bears against the projection 7c on the top of the presser-stem 7c and lifts the cloth-feeding presser-foot K, whereupon the detent S engages in the notch 706, thereby keeping the cloth-feeding presser-foot up after the stud fr" has freed the projection 7c. The needle has now commenced another downstroke, and the stud Z4 bears against the lower edge of the serpentine slot q, whereupon the lever R is moved 'a little and the notch k thereby released from the hold of the detent S, when the cloth-feeding presser-foot K is brought down upon the cloth by the spring 7a2 in t-i me to hold the cloth steady while the needle is penetrating it.

lVith reference to the bent link P and its function as the intermediary between the two `links L and M, I wish to point out that the slot Z and stud m will throw the shuttle backward and forward, though the use of the intermediary link P causes the shuttle to be thrown through the loop in the top thread earlier than it would be by the operation of the slot Z and the stud m only, and that in addition to the acceleration of the throw of the shuttle irregularities of motion on the part of the latter, which might be occasioned by the weight of the bell-lever N, the shuttle-case O, and the shuttle 0 during` the time the stud m is out of contact with eitherend of the slot l, are prevented by the bent link P, and the link M is kept always under the control of the link L'. IVhen the slot l and stud m are relied on for the actuation of the shuttle, the length of t-he former should be about three-quarters that ot the stroke of the needle.

I am aware that there have been already patented the following combinations in conmachines as constituting more hopefully than practically a pocket sewing-machine:

1. The combination,with the bracket-frame and its cloth plate, of the needle-bar arranged to slide vertically in said frame and extending both above and below the cloth-plate, and the pivoted shuttle-lever having a pin-andslotconnection with said needle-bar.

2. The c0mbination,with the bracket-frame and its cloth-plate and the needle-bar sliding vertically therein, of the pivotcd lever F, the cloth-presser and feed-lever G, provided with cam projections, and the shuttle-lever II, all of these instrumentalities connected to and operated directly by the needle-bar.

3. The pivotcd shuttle-lever and the shuttle basket or cradle attached thereto, in combination with the bracket-frame, the clothplate, the verticallysliding needle-bar provided with a pin which enters a slot in the ,shuttle-lever, and the guard-plate l, under the arrangement and for the operation as set forth.

I wish it to be distinctly understood that I lay no claim to any of the above-recited combinations; but

That I do claim isl. The combination of a cross-head or needle-bar, a link rigidly attached to the said needle-bar, a bar carrying the cloth-feeding` presser-foot, a stud projecting from the said needle-bar and adapted to engage with a corresponding projection on the top of the stem of the said cloth-feeding presser-foot at each upstroke of the said needle-bar, a spiral spring upon the said stein adapted to return itafter each engagement by the said stud, a plate adapted to be moved in a direction at right angles with that of the said link, and a stud upon the said link adapted to engage in a twicebent slot in the said plate with a lever adapted to move in a plane at right angles with the direction of the said needle-bar and having its fulcrum upon the lower guide of the presser-foot stem, said lever being connected with said plate and with said presserfoot bar, as set forth.

2. The combination ot a stud projecting from the cross-head or needle-bar and adapted to engage with a corresponding projection on the top of the stem of the cloth-feeding presser-foot at each upstroke of the said needle-bar, a spiral spring upon the said stem adapted to return it after each engagement by the said stud, a groove in an enlargement upon the presser-foot stem, and a spring-detent fixed to the standard of the machine and adapted to engage in the said groove each time the said stem is raised, as set forth.

In testimony whereof I have hereunto set my hand.

FREDERICK NESFIELI) COOKSON. Vitnesses:

CHAs. S. WoonRorFE, 22 Southcwnpzfon Buildings, London, W C.

ERNEST LIDDELL, 17 Gmcechurch Street, London, E. C'. 

